Search Publications
New photometric analysis of hot Jupiter: WASP-135b
Erdem, Ahmet; Öztürk, Oğuz
We report photometric follow-up observations of WASP-135b obtained using the 1.23-m telescope at Calar Alto Observatory and 1.00-m telescope at TÜBİTAK National Observatory during the 2017 and 2018 observational seasons. Eight new transit light curves of WASP-135b were analyzed with JKTEBOP code. The ratio of the planet radius to radius of host st…
Interstellar Extinction in the Direction of the Open Cluster King 7 and New Parameters of the Cluster
Straižys, V.; Raudeliūnas, S.; Maskoliūnas, M. +8 more
Interstellar extinction in two concentric square areas of the sizes 1.25 × 1.25 deg2 and 0.2 × 0.2 deg2 in the direction of open cluster King 7 is investigated applying two-dimensional photometric classification of stars observed in the Vilnius seven-color photometric system down to V = 15.5 mag (1084 stars) and 19.5 mag (584…
Effect of Dust Size on the Near-infrared Spectra (1.0-5.0 µm) of Brown Dwarf Atmospheres
Sorahana, Satoko; Kobayashi, Hiroshi; Tanaka, Kyoko K.
In this study, we demonstrate the dependence of atmospheric dust size on the near-infrared spectra of ten L dwarfs, and constrain the sizes of dust grains in each L dwarf atmosphere. In previous studies, by comparing observed and modeled spectra, it was suggested that the deviations of their spectral shapes from theoretical prediction are general …
A Brief Review of the Ring Current and Outstanding Problems
Kronberg, Elena A.; Ilie, Raluca; Fraz Bashir, Muhammad
The Faraday rotation effect in Saturn Kilometric Radiation observed by the CASSINI spacecraft
Lamy, Laurent; Fischer, Georg; Kurth, William S. +7 more
Non-thermal radio emissions from Saturn, known as Saturn Kilometric Radiation (SKR), are analyzed for the Faraday rotation effect detected in Cassini RPWS High Frequency Receiver (HFR) observations. This phenomenon, which mainly affects the lower-frequency part of SKR below 200 kHz, is characterized by a rotation of the semi-major axis of the SKR …
Adventures in Space Science
Doschek, George
This memoir is a summary of my early childhood, education, and research career at the Naval Research Laboratory (NRL) in Washington, DC. I describe my early interest in astronomy and how I wound up working in the fields of solar physics and X-ray-UV spectroscopy of high temperature plasmas. I describe some of my home life and other interests, my e…
Revisiting magnetospheric CAPS TOF data post Cassini
Wilson, R. J.; Reisenfeld, D. B.; Allen, R. C. +2 more
The Cassini Plasma Spectrometer has a Time-of-Flight sensor capable of separating out the major magnetospheric ions at Saturn of protons, ions with a mass to charge of 2 amu/q, and water group ions (O+, OH+, H2O+ and H3O+), yet until this study a survey of their relative proportions…
Mapping Solar X-Ray Images from SDO/AIA EUV Images by Deep Learning
Yang, Bo; Yang, Jiayan; Bi, Yi +6 more
The full-Sun corona is now imaged every 12 s in extreme ultraviolet (EUV) passbands by Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), whereas it is only observed several times a day at X-ray wavelengths by Hinode/X-Ray Telescope (XRT). In this paper, we apply a deep-learning method, i.e., the convolution neural network (CNN), to es…
Radiometric Calibration of the Rosetta Navigation Camera
Statella, Thiago; Andrés, Rafael; Geiger, Bernhard
The Navigation Camera (NavCam) on board the Rosetta spacecraft was essential for optical navigation in the vicinity of the comet 67P/Churyumov-Gerasimenko. Images acquired throughout the mission are also of high scientific interest. In order to extend the range of potential applications, we generated datasets of radiometrically calibrated images. …
On the photoevaporation, dust polarization and kinematics of two nebulae in Sh2-236
Soam, Archana
In the work presented here, the impact of magnetic field on the dynamical evolution of cometary globules Sim 129 and Sim 130 in the Sh2-236 HII region and the ionized gas streaming out of their surfaces is investigated. The magnetic field morphology in the region associated with these globules is inferred using optical polarization measurements wi…